United States President Donald Trump on Friday took to Twitter to vent his anger on unfavourable reports on him. This time, he called the former director of the Federal Bureau of Investigation, James Comey, an “untruthful slime ball” who “should be prosecuted”. “James Comey is a proven LEAKER & LIAR,” he said.

Trump’s tweets were in response to details of Comey’s memoir that emerged in the media. A Higher Loyalty, which will be released on Tuesday, includes his account of his interactions with the president. In his book, Comey called Trump a bully and a mob boss, besides describing him as being “untethered to the truth”, CNBC reported.

The US president had abruptly fired the former FBI director in May 2017, purportedly because of the way he handled the controversy around Hillary Clinton’s emails. Comey had also been leading an investigation into the Trump campaign’s ties to Russia thens.

“His handling of the Crooked Hillary Clinton case and the events surrounding it will go down as one of the worst ‘botch jobs of history,” Trump tweeted on Friday. “It was my great honour to fire James Comey!”